No signal, canceling contract

1) I never have signal at home or on the road on my new iphone 6. People can't hear me and I can't send SMS,s! My query has been open since May case no ***9. They say they can't get hold of me... That's because I never have signal or connection. 2) I then went into the branch to cancel my contact ( as that's what the call centre said I must do) to be told some one will contact you with in 3 days from the call centre!! I'm still waiting and it's been 8 working days later! Out of 22 problems you can tick to cancel your contract I have 11 of them. 3) I also have a R1 cap on my account. And I have a query open as I now have a bill on my account which I am not paying as I did not authorize anything, when I signed the contact it has a R1 limit and that shows on your system as well. <br> You have both my numbers on the system this is the worst service I have ever experienced I have had this contract since March and have not been able to even use my phone! I need to cancel this *******, and if you dare take off the R645.40 instead of the R549 I will take this matter further as I did not authorize anything!!